Machine for the reduction of wood to paper-pulp



(No Model.)

A. H. RITCHIE.

MACHINE FOR THE REDUCTION OF WOOD T0 PAPER PULP. No. 351,285.

.W/T/VESSES:

ATTORNEYS N. PETERS Phomumo n hu Washinglnm n. c.

'NITED STATES PATENT FFICE.

ALEXANDER H. RITCHIE, OF BROOKLYN, NEXV YORK.

SPECIFICATION forming part of Letters Patent No. 351,285, dated October19, 1886.

Application filed August 25, 1885.

To all whom it may concern.-

Be it known that I, ALEXANDER H. RITCHIE, a citizen of the UnitedStates, residing at Brooklyn, in the county of Kings and State of NewYork, have invented certain new and useful Improvements in Machines forthe Reduction of food to Paper-Pulp, of which the following is aspecification.

My invention relates, primarily, to the construction and arrangement ofthe grinder or grinding-wheel, and, secondly, to the placing of the feedboxes or hoppers to conform to the shape of the grinder, as will beexplained.

My invention consists in forming a wheel with beveled edges or corners,said beveled portions being sufficientlylarge to constitutegrindingsurfaces, and in placing the emery or other grinding materialupon these beveled surfaces and upon the periphery of the wheel.

The object of my invention is to produce a grinder whosegrinding-surfaces are less liable to crack and fly off than those whichemploy broad peripheries with the emery or other grinding material onthem alone. For instance, in this class of machines now in usegrinding-surfaces sixteen or seventeen inches wide are employed. Theseare liable to, and in factjoften do, break and fly off, owing to theirgreat breadth. By dividing them up, as I do, and making the differentgrinding-surfaces about twelve inches wide, this difliculty is avoided.

Another advantage of my machine arises from the fact that the hoppers orfeed-boxes may be placed farther apart, the result being that thegrinder may be thoroughly cleaned by means of the water between thedifferent boxes, thus preventing rcgrinding of the pulp. The boxes arearranged in gangs transversely of the grinder, and correspond. in numberto the number of grinding-surfaces.

Referring to the accompanying drawings, which form a part of thisspecification, Fig ure 1 represents an end elevation of the grinder,with portions of the inclosing-casing and the hoppers cut away. Fig. 2is a sectional view on the line as a", Fig. 1.

The grinder or emery-wheel A is provided with a flat portion, A, 011 theperiphery and beveled portions A on both sides. These Serial No.175,275. (No model.)

three parts constitute the grimling-surfaces of the wheel; but they arenot limited to this number, as they may be increased to four, five, ormore without departing from the spirit of my invention.

The grinding-wheel turns on a suitably journaled axle, B, and isinclosed by a casing, G. The bottom of the casing may be arranged in anysuitable manner for withdrawing the pulp. Resting upon and extendinginto the casing nearly as far as the grinding-wheel are the hoppers orfeed-boxes D D D E E E, and F E E. They are set in perpendicularpositions corresponding to the grindingsurfaces against which they areset. The hoppers are provided with doors G, into which the wood, cc, tobe reduced is fed, and with pistons and piston-rods H, to which pressuremay be applied in any suitable manner. WVater-pipes J open into thecasing, and are so arranged that the grinding-wheel may be flooded justafter it passes from beneath a hopper, so that all pulp may be washedfrom it and the aforesaid wheel or grimlingsurface may be perfectlyclear and clean by the time it reaches another hopper.

Having thus described my invention, what I claim as new therein, anddesire to secure by Letters Patent, is

1. In a machine for the reduction of wood to pulp, a grinder or grindingwheel having three or more grinding surfaces, as set forth and shown.

2. In a machine for the reduction of wood to pulp, the wheel havinggrimling-surfaces on the periphery and on the beveled portions, as andfor the purposes set forth.

3. The combination of a grinder and the hoppers or feed-boxes arrangedin gangs or rows transversely of the aforesaid grinder.

4. The combination of the casing having one or more rows of hoppers orfeed-boxes set into it, as described, and the grinding-wheel having agrinding-surface on its periphery and grinding-surfaces on its beveledportions, as shown and described.

ALEXANDER H. RITCHIE.

Witnesses:

HERBERT KNIGHT, \VM. E. KNIGHT.

